Thor Motor Coach 20A Promaster keeps an estimated 58% of its value after 5 years — #2553 of 5948 RVs & trailers VINdown tracks. See its full depreciation curve, cost per day, and best model year to buy.
Per VINdown's modeling, the Thor Motor Coach 20A Promaster retains an estimated 58% of its value after five years, ranking #2553 of 5948 RVs & trailers we track. That trails the 72% five-year average for Class B in its class by 15 points, so it depreciates faster than most rivals.
Most of the loss lands early: the Thor Motor Coach 20A Promaster sheds about 28% of its value in year one alone. From roughly $148,120 it falls to around $85,317 by year five — a five-year loss near $62,803, about $34.41 a day in depreciation.
Because the steepest drop hits around year 1, a lightly-used Thor Motor Coach 20A Promaster bought at 1 year old lets the first owner absorb the worst of the depreciation while the curve flattens — usually the value sweet spot. Explore the full year-by-year curve, trims, and true cost of ownership in the Model Lab above.
It keeps an estimated about 58% of its value after five years — better than most among the 5948 RVs & trailers VINdown tracks (ranked #2553).
From about $148,120 it drops to roughly $85,317 after five years — a loss near $62,803 (58% retained).
Around 1 year old: that is just past the steepest depreciation, so you skip the biggest drop while the value curve is flattening.
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